Document And Entity Information Statistical Measurement [Axis] Note To Financial Statement Details Textual Document Fiscal Period Focus EBP, Basis of Accounting [Policy Text Block] EBP, Note Receivable from Participant [Policy Text Block] Significant Accounting Policies Document Fiscal Year Focus Note 4 - Fair Value Measurements us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountReallocatedToParticipant EBP, Forfeited Nonvested Account, Reallocated to Participant Schedule H, Line 4i - Schedule of Assets Note 4 - Fair Value Measurements - Schedule of Fair Value and NAV (Details) Amendment Flag Schedule H, Line 4i - Schedule of Assets - Schedule of Company Assets (Details) Schedule H, Line 4i - Schedule of Assets - Schedule of Company Assets 2 (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] Minimum [Member] dei_DocumentPeriodEndDate Document Period End Date Statistical Measurement [Domain] Maximum [Member] Legal Entity [Axis] EBP, Schedule of Asset Held for Investment [Table] Non-interest bearing cash Notes receivable from participants dei_EntityTaxIdentificationNumber Entity Tax Identification Number EBP, Investment, Fair Value and NAV [Text Block] Entity [Domain] Interest on notes receivable from participants Entity Central Index Key Net appreciation in fair value of investments Bank Accounts, Collective Trust Funds, and Money Market Accounts [Member] Represnts the bank accounts, collective trust funds, and money market accounts. dei_EntityRegistrantName Entity Registrant Name Entity Current Reporting Status EBP, Description of Plan [Text Block] EBP, Asset Held for Investment EBP, Related Party and Party-in-Interest Transactions [Table] Current Fiscal Year End Date us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterDate EBP, Tax Determination Letter, Date EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncrease Total additions Fair Value Measured at Net Asset Value Per Share [Member] Entity Shell Company Common Collective Trust [Member] Entity Emerging Growth Company Entity Small Business Investments [Domain] Participants’ benefit payments Accounting Policies [Abstract] Rollovers from participants Excess contributions payable EBP, Excess Contribution Payable Contributions from Company EBP, Risk and Uncertainty [Table] us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment Net investment gain Valuation Approach and Technique [Domain] us-gaap-ebp_EmployeeBenefitPlanTaxQualificationStatusExtensibleEnumeration EBP, Tax Qualification Status [Extensible Enumeration] Valuation, Market Approach [Member] us-gaap-ebp_EbpPlanName EBP, Plan Name Statement of Stockholders' Equity [Abstract] EBP, Tax Status [Text Block] us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount EBP, Forfeited Nonvested Account us-gaap-ebp_EmployeeBenefitPlanInvestmentValuationTechniqueExtensibleEnumeration EBP, Investment, Valuation Technique [Extensible Enumeration] State Street Bank & Trust Co. Equity Components [Axis] Investments, at fair value Class of Stock [Axis] Equity Component [Domain] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAllowanceForCreditLoss EBP, Note Receivable from Participant, Allowance for Credit Loss Fair Value, Inputs, Level 1 [Member] EBP, Subsequent Event [Table] us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease Net increase in net assets available for benefits Deductions: Additions: cvti_EBPVestingYearsOfService EBP, Vesting Years Of Service (Year) Number of vesting years of service in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) cvti_EBPSharePrice EBP, Share Price (in dollars per share) The price per share related to the employee benefits plan. cvti_EBPHardshipAgeForParticipant EBP, Hardship Age for Participant The age allowed for the hardship distributions. us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate EBP, Asset Held for Investment, Participant Loan, Interest Rate cvti_EBPParticipantSelfContributionsVestedPercentage EBP, Participant Self Contributions, Vested Percentage The percentage of participant self contributions that are vested in an employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). cvti_EBPEmployerContributionDiscretionaryCompensationMatchPercentage EBP, Employer Contribution, Discretionary Compensation Match, Percentage Percent of discretionary compensation matching from the company. us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForEmployerContribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution cvti_EBPTaxPercentOnHardshipDistribution EBP, Tax Percent on Hardship Distribution The tax percentage on the hardship distributions. Investment income: Interest and dividends Unitized CVTI Fund [Member] Represents the Unitized CVTI fund. Fidelity [Member] Represents Fidelity investments. Hartford [Member] Represents Hartford investments. Collective Trust Fund EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value American Funds [Member] Represents the American funds. BNY [Member] Represents the BNY investments. Covenant [Member] Represents Covenant. Schedule of Assets [Text Block] The entire disclosure for schedule of asset held for investment for employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). State Street Bank & Trust Co. [Member] Represents State Street Bank & Trust Co. Putnam [Member] Represents Putnam investments. BNY Mellon [Member] Represents BNY Mellon investments. Great Gray [Member] Represnts Great Gray investments. Prudential [Member] Represents Prudential investments. Administrative fees T. Rowe Price [Member] Represents T. Rowe Price investments. JPMorgan [Member] Represents the JPMorgan investments. Investment, Identifier [Axis] Macquarie [Member] Represents Macquarie investments. SEI [Member] Represents SEI investments. State Street [Member] Represents State Street investments. EBP, Accounting Policy [Table] EBP, Description of Plan [Table] Statement [Table] EBP, Tax Status [Table] cvti_EmployeeBenefitPlanNoteReceivableFromParticipantTerm Employee Benefit Plan, Note Receivable From Participant, Term (Year) The term for the notes receivable from participant for the employee benefits plan. Cash [Member] Fair Value Hierarchy and NAV [Domain] us-gaap-ebp_EmployeeBenefitPlanPlanNumber EBP, Plan Number EBP, Risk and Uncertainty [Text Block] Statement of Financial Position [Abstract] cvti_EmployeeBenefitPlanNoteReceivableFromParticipantInterestRateSpreadOnPrimeRate Employee Benefit Plan, Note Receivable From Participant, Interest Rate Spread On Prime Rate The interest rate spread on prime rate for the notes receivable from participants. cvti_EmployeeBenefitPlanVestedPercentageOnPlanTermination Employee Benefit Plan, Vested Percentage On Plan Termination The vesting percentage on the plan termination. Investment Type [Axis] us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage EBP, Employer Contribution, Matching Percentage Mutual Fund [Member] EBP, Schedule of Asset Held for Investment [Text Block] EBP, Subsequent Event [Text Block] us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage EBP, Subsequent Event [Policy Text Block] us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration EBP, Investment, Issuer Name [Extensible Enumeration] dei_DocumentType Document Type EBP, Summary of Accounting Policy [Text Block] Document Information [Line Items] EBP, Investment [Policy Text Block] Company contribution receivable Document Information [Table] Participants’ contribution receivable Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Entity Interactive Data Current Statement [Line Items] Fair Value Hierarchy and NAV [Axis] us-gaap-ebp_EmployeeBenefitPlanAsset Total assets us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage EBP, Employer Contribution, Participant Compensation Matched, Percentage Investment, Issuer Name [Domain] EBP 88-0320154 001 [Member] The employee benefits plan. Other receivable us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease Total deductions EBP, Related Party and Party-in-Interest Transactions [Text Block] Assets: Liabilities: us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit Net assets available for benefits Net assets available for benefits at beginning of year Net assets available for benefits at end of year EBP, Investment, Fair Value and NAV [Table Text Block] us-gaap_PolicyTextBlockAbstract Accounting Policies Contributions from participants EBP, Investment, Fair Value and NAV [Table] cvti_PolicyTable us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Retirement Plan Tax Status [Domain] us-gaap_TableTextBlock Notes Tables Qualified Plan [Member]